MK74CB44R [ICSI]

Quad 1 to 4 Buffalo⑩ Clock Driver; 四1 〜4布法罗™时钟驱动器


型号：	MK74CB44R
厂家：	INTEGRATED CIRCUIT SOLUTION INC
描述：	Quad 1 to 4 Buffalo⑩ Clock Driver 四1 〜4布法罗™时钟驱动器时钟驱动器逻辑集成电路光电二极管
文件：	总5页 (文件大小：77K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

PRELIMIN ARY IN FO RMAT IO N

MK74CB44

Quad 1 to 4 Buffalo™ Clock Driver

Description

Features

The MK74CB44 Buffalo™ is a monolithic

CMOS high speed clock driver. It consists of

four identical single input to four low-skew

output, non-inverting clock drivers. When

combined with ICS’s MK series of low jitter

clock synthesizers, the chips form an unequaled

high performance clocking scheme. This

monolithic solution can eliminate concern for

part-to-part skew matching. The MK74CB44 is

packaged in the tiny 28 pin SSOP, which uses the

same board space as the narrow 16 pin SOIC.

• Tiny 28 pin SSOP (150 mil) package

• Quad one input to four output clock drivers

• Outputs are skew matched to within 250ps

• A, B, C and D banks matched to 250ps

• 3.3V±10% and/or 5V±10% supply voltage

• Clock speeds up to 200 MHz

• For tighter skew matching, more outputs, or

other speeds, consult ICS for other solutions

Family of ICS Parts

The MK74CB44 Buffalo™ is designed to be used

with ICS’s clock synthesizer devices. The inputs

of the Buffalo are matched to the outputs of ICS

clock synthesizers. Consult ICS for applications

support.

Block Diagram

VDD

INA

QA0

IND

QD0

QA1

QD1

QD2

QD3

QC0

QA2

QA3

QB0

QB1

QB2

QC1

QC2

QB3

INB

QC3

INC

GND

MDS 74CB44 B

Revision 022000

Printed 11/17/00

Integrated Circuit Systems, Inc. • 525 Race St. • San Jose • CA • 95126 • (408)295-9800tel • www.icst.com

PRELIMIN ARY IN FO RMAT IO N

MK74CB44

Quad 1 to 4 Buffalo™ Clock Driver

Pin Assignment

Suggested Layout

INA 1

QA0 2

IND

QD0

QD1

QD2

VDD

QA1

QA2

VDD

QA3

22 QD3

0.01µF

QB0 8

QC0

GND

QC1

QC2

QC3

INC

GND

GND 10

QB1 11

QB2 12

QB3 13

INB 14

For simplicity,series terminating resistors (required) are not

shown for the outputs, but should be placed as close to the

device as possible. It is most critical to have the 0.01µF

decoupling capacitors closest.

= connect to VDD

G = connect to GND

Pin Descriptions

Number

Name

Type Description

INA

Clock input for four A outputs.

Clock A outputs.

2, 3, 4 QA0, QA1, QA2

5, 6

VDD

QA3

QB0

GND

Power supply. Connect to +3.3 V or +5 V. Must be the same as pins 23, 24.

Clock A output.

Clock B output.

9, 10

Connect to ground.

11, 12, 13 QB1, QB2, QB3

Clock B outputs.

INB

INC

Clock input for four B outputs.

Clock input for four C outputs.

Clock C outputs.

16, 17, 18 QC3, QC2, QC1

19, 20

GND

QC0

QD3

VDD

Connect to ground.

Clock C output.

Clock D output.

23, 24

Power supply. Connect to +3.3 V or +5 V. Must be the same as pins 5, 6.

Clock D outputs.

25, 26, 27 QD2, QD1, QD0

28 IND

Clock input for four D outputs.

Type: I = Input, O = output, P = power supply connection

MDS 74CB44 B

Revision 022000

Printed 11/17/00

Integrated Circuit Systems, Inc. • 525 Race St. • San Jose • CA • 95126 • (408)295-9800tel • www.icst.com

PRELIMIN ARY IN FO RMAT IO N

MK74CB44

Quad 1 to 4 Buffalo™ Clock Driver

Electrical Specifications

Parameter

Conditions

Minimum

Typical

Maximum

Units

ABSOLUTE MAXIMUM RATINGS (Note 1)

Supply Voltage, VDD

Inputs

Referenced to GND

VDD+0.5

Referenced to GND

0.5

Clock Outputs

Ambient Operating Temperature

Soldering Temperature

Storage Temperature

°C

Max of 20 seconds

260

-65

150

DC CHARACTERISTICS (VDD = 3.3 V unless noted)

Operating Voltage, VDD

3.0

3.3

5.5

Input High Voltage, VIH

VDD-1

VDD/2

Input Low Voltage, VIL

Output High Voltage

IOH=-8mA

IOH=-12mA

IOL=12mA

No Load

VDD-0.4

2.4

Output High Voltage

Output Low Voltage

0.8

Operating Supply Current, IDD, at 100 MHz

Output Impedance

Short Circuit Current

Each output

Input Capacitance

AC CHARACTERISTICS (VDD = 3.3 V unless noted)

Input Clock Frequency

Note 4, 5

200

MH z

Propagation Delay with load=15pF

Output Clock Rise Time

1.4

0.8 to 2.0V

Output Clock Fall Time

2.0 to 0.8V

Output Clock Rising Edge Skew

Output Clock Bank to Bank Skew

At VDD/2. Note 2

At VDD/2. Note 3

100

250

Notes:

1. Stresses beyond those listed under Absolute Maximum Ratings could cause permanent damage to the device. Prolonged exposure

to levels above the operating limits but below the Absolute Maximums may affect device reliability.

2. Within any bank of four outputs, with equal loading.

3. Between any two banks of four with their inputs connected together, and equal loading.

4. At VDD = 3.3 V, 70°C, series termination of 33 W per pin, 8 pF load per pin.

5. See discussion and graph of speed versus load.

MDS 74CB44 B

Revision 022000

Printed 11/17/00

Integrated Circuit Systems, Inc. • 525 Race St. • San Jose • CA • 95126 • (408)295-9800tel • www.icst.com

PRELIMIN ARY IN FO RMAT IO N

MK74CB44

Quad 1 to 4 Buffalo™ Clock Driver

Maximum Speed/Application Notes

The maximum speed at which the chip can operate is limited by power dissipation of the package. Graph 1

shows the operating frequency plotted against load capacitance per pin for a die temperature of 125°C. This is

at VDD = 3.3 V, 70°C and with 33 Wseries termination resistor. The termination resistors are essential

because they allow a large proportion of the total power to be dissipated outside the package. Reducing or

eliminating the series termination will cause an increase in die temperature. It is not recommended to operate

the chip at die temperature greater than 125°C. Also note that the load capacitance per pin must include PC

board parasitics such as trace capacitance. ICS has other buffers specified to 250 MHz with heavier loads.

If not all outputs of the chip are used, it is possible to operate the chip faster with larger loads. Unused outputs

should be left unconnected. Consult ICS for your specific requirement.

300

250

Do not operate in this area .

200

150

100

Load Capacitance/per pin (pF), all 16 outputs loaded

Graph 1

MK74CB44

Maximum Speed at 3.3 V

MDS 74CB44 B

Revision 022000

Printed 11/17/00

Integrated Circuit Systems, Inc. • 525 Race St. • San Jose • CA • 95126 • (408)295-9800tel • www.icst.com

PRELIMIN ARY IN FO RMAT IO N

MK74CB44

Quad 1 to 4 Buffalo™ Clock Driver

Package Outline and Package Dimensions

(For current dimensional specifications, see JEDEC Publication No. 95.)

28 pin SSOP

Inches

Symbol Min

Millimeters

Max

0.053 0.069

Min

1.35

Max

1.75

0.004 0.010 0.102

0.008 0.012 0.203

0.007 0.010 0.191

0.254

0.305

0.254

0.386 0.394 9.804 10.008

.025 BSC 0.635 BSC

0.228 0.244 5.791

0.150 0.157 3.810

0.016 0.050 0.406

6.198

3.988

1.270

Ordering Information

Part/Order Number

Marking

Package

Temperature

MK74CB44R

28 pin SSOP

Add Tape & Reel

0-70°C

MK74CB44RTR

While the information presented herein has been checked for both accuracy and reliability, ICS Incorporated assumes no responsibility for either its use or for the infringement of

any patents or other rights of third parties, which would result from its use. No other circuits, patents, or licenses are implied. This product is intended for use in normal

commercial applications. Any other applications such as those requiring extended temperature range, high reliability, or other extraordinary environmental requirements are not

recommended without additional processing by ICS. ICS reserves the right to change any circuitry or specifications without notice. ICS does not authorize or warrant any ICS

product for use in life support devices or critical medical instruments.

Buffalo is a trademark of ICS Incorporated

MDS 74CB44 B

Revision 022000

Printed 11/17/00

Integrated Circuit Systems, Inc. • 525 Race St. • San Jose • CA • 95126 • (408)295-9800tel • www.icst.com

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